#include <iostream>
using namespace std;

int n;
char a, b, c;

void dfs(int n, char x, char y, char z)
{
	if (n == 0)	return;
	
	dfs(n - 1, x, z, y);
	printf("%c->%d->%c\n", x, n, z);
	dfs(n - 1, y, x, z);
}

int main()
{
	cin >> n >> a >> b >> c;

	dfs(n, a, c, b);

	return 0;
}